A cold-tolerant biennial grown as an annual that delivers fresh, bright flavor from spring through hard frost and beyond.
Petroselinum crispum · also called curly parsley, flat-leaf parsley
Windows are counted from the average date of your last spring frost.
Parsley is one of the most productive cut-and-come-again herbs per square foot, yielding continuously for months. Both curly and flat-leaf types are far more flavorful fresh than dried, making a home planting genuinely worthwhile.
A little history. Native to the central Mediterranean region, parsley is a biennial — completing its life cycle over two growing seasons — but is almost always grown as an annual because it bolts (shifts from leaf growth to flowering) and turns bitter in its second year.
Sow seeds ¼ inch (6 mm) deep, and aim for 9 inches (25 cm) between plants once thinned. Sow seeds ¼ inch deep and keep the top half-inch consistently moist; soaking seeds in warm water for 24 hours before sowing speeds emergence. Seedlings emerge in 14–28 days.
Either works well — needs at least 8 inches of soil depth for its taproot to develop properly. In containers: 8-inch pot minimum; 12-inch or larger for sustained harvest.
Water deeply when the top inch of soil feels dry, roughly twice a week in warm weather. Water when top inch of soil feels dry to the touch; leaves begin to look slightly dull. Aim for about 1 inch per week including rain.
Side-dress (scatter fertilizer along the row and water in) once a month during active growth. What to use: balanced 5–5-5 organic granular or a compost top-dressing; avoid high-nitrogen feeds that reduce flavor.
Harvest outer stems at the base regularly to encourage new growth from the center. Remove any flower stalks immediately as they appear to delay bolting and extend the harvest.
It's ready when harvest once stems have at least three leaf segments and the plant is at least 6 inches tall. Outer stems are ready before inner ones. Cut outer stems at the base with scissors or a sharp knife, leaving the inner stems to continue growing. Never remove more than one-third of the plant at a single harvest.
Stand cut stems in a glass of water in the refrigerator, loosely covered with a plastic bag, for up to 2 weeks. Alternatively, freeze chopped leaves flat on a tray then transfer to a bag.
Sow a second batch 4–6 weeks after the first to maintain a continuous supply; given slow germination, starting the second batch indoors while the first is still establishing outdoors works well.
In climates with mild winters, mulch the crown with 2–3 inches of straw after the first hard frost; plants often survive and produce a flush of new leaves in early spring before bolting.
Tomato
Low parsley fills the open ground under staked tomatoes without crowding them, and any plant left to flower opens flat umbels that feed hoverflies and tiny parasitic wasps — the insects that work over tomato aphids and hornworm eggs.
Asparagus
Asparagus crowns feed from deep, permanent roots while parsley works the top 8 inches with its taproot, so the two share the bed without fighting over water. Parsley also covers bare soil between crowns while the spears are still short.
Chives
The onion scent of chives can help hide young parsley from carrot fly, which finds carrot-family plants by smell. Treat it as a small edge, not a substitute for fine insect mesh over the row.
Carrot
Gardeners have long paired these carrot-family relatives, and they do want the same deep, loose, evenly moist soil. No mechanism is demonstrated, and both attract carrot fly — so if you grow them side by side, mesh the whole planting as one.
Rose
Parsley is said to keep aphids off roses, a pairing that has circulated on companion charts for a century without supporting trials. It does make a tidy, harvestable edging at the foot of a rose, so the risk of trying it is small.
Fennel
Fennel roots release compounds that reliably stunt most garden vegetables, parsley included, and the two also share carrot fly. Plant fennel in its own corner well away from the bed, where its flowers can still feed hoverflies and tiny parasitic wasps.
Spearmint
Spearmint spreads by runners just below the surface and will thread through a parsley clump within a season, making clean cutting impossible. Grow mint in a sunken pot or a separate container, never loose in the same bed.
Peppermint
Peppermint spreads by underground runners and will thread through a parsley clump within one season, making the parsley impossible to lift or divide cleanly. Keep mint in its own pot, or at least 24 inches away behind a root barrier.
Give the carrot family 3 years away from this spot before any of its relatives return.
The pea and bean family, the cabbage family or the onion family thrive in this ground next season.
Parsley is a light feeder and leaves the bed close to how it found it, though its taproot loosens the top few inches. Keep carrot-family crops (carrot, dill, celery, parsnip) out of this spot for 3 years. Follow with peas or beans, then cabbage-family or onion-family crops.
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